CN1185627C - Interval change method and device - Google Patents
Interval change method and device Download PDFInfo
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- CN1185627C CN1185627C CNB011406917A CN01140691A CN1185627C CN 1185627 C CN1185627 C CN 1185627C CN B011406917 A CNB011406917 A CN B011406917A CN 01140691 A CN01140691 A CN 01140691A CN 1185627 C CN1185627 C CN 1185627C
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/18—Selecting circuits
- G10H1/20—Selecting circuits for transposition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/007—Two-channel systems in which the audio signals are in digital form
Abstract
A method for shifting a pitch of acoustic signals, which are expressed in terms of a series of digital signals, to an optional pitch, uses a compacting and/or expanding process on the time axis and cross-fades a fade-in acoustic signal, stored in a memory. A fade-out acoustic signal and a fade-in acoustic signal are read out from the memory which is then compacted and expanded on the time axis. The fade-in and fade-out acoustic signals compacted and expanded on the time axis are cross fade processed. The fundamental tones of the two series of signals perform the compensation of the phase difference between the fade-in and fade-out acoustic signals.
Description
Technical field
The interval change that the present invention relates to the acoustic signal digital signal sequences represented with time shaft compression expansion and cross fade (Network ロ ス Off エ one De) processing is the interval change method and the device thereof of any interval.
Background technology
For example, the Karaoke etc. in, be transformed to the interval of easily singing for the speed that does not change melody, use this musical interval changing device.
That is, so-called musical interval changing device is meant as the tone controller that uses in the Karaoke etc. the interval of acoustic signal, is the device of frequency transformation as the constant times of primary frequency.
So far, proposed various interval change methods, and the present invention relates to technology by the time shaft compression is expanded and cross fade comes digital signal sequences is carried out interval change.
Here, so-called time shaft compression expansion is meant that time shaft to original signal compresses the processing of burst of the constant times of expansion, generation primary frequency.
And so-called cross fade is handled, and is meant following processing: the part signal that takes out from original signal is faded in, the part signal different with this part signal faded out, two parts of signals is overlapped on time shaft.
Then, this prior art is described.
(prior art 1: the interval change technology of uncompensation phase differential)
The principle of interval change at first, is described with Fig. 9.
Time shaft compression expansion
In Fig. 9, transverse axis is the time, and the longitudinal axis is the amplitude of signal.
Fig. 9 (a) illustrates the waveform of original signal.
Here, if carry out time shaft compression expansion, then can conversion interval (frequency).
For example, if the original signal shown in Fig. 9 (a) is carried out the time shaft compression, then original signal is transformed high frequency, shown in Fig. 9 (b).
At this moment, the recovery time of the signal (Fig. 9 (b)) after the time shaft compression is shorter than the recovery time of original signal (Fig. 9 (a)).
On the other hand, if the original signal shown in Fig. 9 (a) is carried out the time shaft expansion, then original signal is transformed low frequency, shown in Fig. 9 (c).
At this moment, the recovery time of the signal (Fig. 9 (c)) after the time shaft expansion is longer than the recovery time of original signal (Fig. 9 (a)).
As mentioned above, if carry out time shaft compression expansion, then the recovery time is different with the recovery time of original signal.When existing like this, switching place of window discontinuous, produce problem such as noise.
Therefore, in prior art 1, manage in time shaft compression expansion, to add cross fade and handle, the recovery time is not changed.
The combination that time shaft compression expansion and cross fade are handled
The combination that Figure 10 schematically illustrated time shaft compression expansion and cross fade are handled.Figure 10 (a) illustrates the example that carries out the time shaft compression, and Figure 10 (b) illustrates the example of time shaft expansion.
In Figure 10 (a), top (1) illustrates the original signal that digital signal sequences is represented.Middle part (2) illustrates the process that time shaft compression is handled, and bottom (3-1), (3-2) illustrate the 1st example and the 2nd example that cross fade is handled.Oblique line in the square frame of bottom (3-1), (3-2) represents to carry out the position of cross fade, long cross fade in the 1st example (3-1), and in the 2nd example (3-2), carry out the gradual change of short delivery fork.
The component that is positioned at this oblique line downside is the component that fades in, and the component that is positioned at upside is the component that fades out.
Then, being described more specifically each with Figure 10 (a) handles.
Here, take-off time is handled for the part signal of (T1+T1) from original signal.
Time (T1+T1) for example is about 0.1 second short time.
In addition, the ratio of compression K1 that supposes time shaft has this relation of T2=K1*T1 greater than 1.
Then, take-off time is the part signal of (T2+T2) from original signal, and its preceding half point amount A1 is assigned as the side of fading in, and later half component B2 is assigned as the side of fading out.
Then, these component A 1, B2 are implemented the time shaft compression that ratio of compression is K1, obtain half point amount A1H and the later half component B2H in compression back before the compression back.
Certainly, the recovery time of these component A 1H, B2H all is a time T 1.
Then, take-off time is the part signal of (T2+T2), and its preceding half point amount A2 is assigned as the side of fading in, and later half component B3 is assigned as the side of fading out, and makes consistent with the front of the later half component B2H that compresses.
Then, these component A 2, B3 are implemented the time shaft compression that ratio of compression is K1, obtain half point amount A2H and the later half component B3H in compression back before the compression back.
Certainly, the recovery time of these component A 2H, B3H all is a time T 1.
Below ask equally half point amount A3H before the compression back ..., and compression back B4H ...
In each component after the compression that obtains like this, to B2H and A2H, B3H and A3H ..., BnH and AnH (n is an integer) carry out cross fade and handle.
As mentioned above, BnH is faded out, AnH is faded in.
Here, can as the 1st example (3-1), carry out cross fade and handle, also can as the 2nd example (3-2), carry out cross fade and handle with near the part the square frame central authorities with the whole interval of square frame.
Shown in Figure 10 (b), reducing under the situation of interval, except " time shaft compression " becomes " time shaft expansion ", ratio of compression less than 1, identical with the situation (Figure 10 (a)) of raising interval.
Handle by this cross fade, the noise that the point of discontinuity of window switching place produces in the time of can suppressing reproduces the interval change output signal with the recovery time identical with original signal.
Below, the structure example of prior art 1 is described with Fig. 8.
As shown in Figure 8, (digital signal sequences is represented) acoustic signal from 807 inputs of sound equipment input terminal temporarily is stored in storer 801.
Read the address of address production part 804 designated memory 801, according to the address of appointment, filtering operation parts 802a, 802b read 2 covers (side of fading in and the side of fading out) burst.
Filtering operation parts 802a, 802b carry out time shaft compression expansion, conversion interval (frequency) to the burst of reading.
803 pairs of cross fade parts carried out 2 cover bursts of time shaft compression expansion and implemented the cross fade processing, and its result is from 808 outputs of sound equipment lead-out terminal.
The problem of the prior art 1 is: when cross fade is handled, because the phase differential between the burst of the fade in burst of side and the side of fading out, so produce the tremolo sense.
Here, once in a while as shown in figure 11, if the phase place unanimity of 2 cover bursts, then in cross fade was handled, the envelope of the amplitude of output signal (line of amplitude peak) did not change, so do not produce the tremolo sense.Yet phase place of this 2 cover burst generally has skew.
Particularly as shown in figure 12, if 2 cover burst phase places are opposite fully, then in cross fade was handled, each signal of these bursts became the relation that mutually offsets, so the amplitude of output signal can be than not carrying out the interval little of cross fade processing.
Therefore, in not carrying out the interval that cross fade handles and carrying out interval that cross fade handles, amplitude is variant, and the result alternately repeats mutually.Therefore, produce the tremolo sense.
(prior art 2: the interval change technology of compensation of phase difference)
, for example can enumerate the spy of Japan and open flat 5-297891 communique its prior art of improving 2 as the problem that is conceived to prior art 1.
In this technology, owing to the reason that produces the tremolo sense is the phase differential that carries out 2 bursts of cross fade processing, in the hope of the phase differential of these 2 bursts, by another burst is moved the amount of this phase differential on time-axis direction, make the phase place unanimity.
More particularly, ask the peak value of 2 bursts, burst is moved the amount of this peak difference.
Yet detailed reason is treated aftermentioned, only says conclusion here, in this technology, if simple voice signal then still can carry out smoothly, but to sophisticated signals such as music (signal that particularly comprises strong homophonic component), the flase drop of peak value is surveyed a lot, may not make the phase place unanimity well.
Summary of the invention
The problem of above prior art 1,2 is summarized as follows:
Prior art 1: in the interval change method of uncompensation phase differential, produce the tremolo sense.
Prior art 2: come in the method for compensation of phase difference at peak value with signal, for sophisticated signal, because the survey of the flase drop of peak value, and the minimizing of tremolo sense is had little effect.
Therefore, the 1st purpose of the present invention is to provide a kind of technology, even sophisticated signal also can suppress the tremolo sense.
In addition, along with the employing of compress technique, sound signal in recent years is that the situation that unit handles increases with the piece.1 piece for example is made of the data of 64,80,192 samples.
Like this, if be that unit comes audio signal with the piece, then the processing in the piece generally is easy to.Yet the processing of crossing over a plurality of is very complicated, and consequently, operand also increases.
For example, be that 48kHz, signal are under the situation of 100Hz in sample frequency, owing to 1 cycle is 480 samples, thus poor for detected phase, need the above ranges of search of 480 samples.
That is, cross over a plurality of, handle complexity, operand is many, and the capacity that is used for the storer of storage signal sequence also increases.
Therefore, the 2nd purpose of the present invention is to provide a kind of interval change technology, even be the processing form of unit with the piece, also can manage to make operand and memory span seldom to get final product.
In order to realize the 1st purpose, the interval change method of the 1st invention comprises: comprising: the acoustic signal that digital signal sequences is represented stores the step in the storer into; From above-mentioned storer, read the step of a secondary signal sequence of one first burst of the side of fading in and the side of fading out; One step during at least one time shaft in described first burst and the secondary signal sequence compressed at least and expand; The step of described first and second bursts of cross fade after carrying out the step that produces output signal; Detect and compensate the phase differential of described first and second bursts so that make the step of described phase differential minimum by the piece of adjusting described first and second bursts; And the step of utilizing the fundamental tone in described first and second bursts to detect and compensate.
According to this structure, owing to can compensate the phase differential of 2 bursts of the fade in side and the side of fading out, so can suppress the tremolo sense.And the compensation of phase differential is carried out according to the fundamental tone component, surveys so can cut down the flase drop of phase differential significantly, even complex sound signals such as music also can suppress the tremolo sense.
In order to realize the 2nd purpose, the musical interval changing device of the 2nd invention comprises storer, the acoustic signal that the storage digital signal sequences is represented; Fetch unit is read the parts of a secondary signal sequence of one first burst of the side of fading in and the side of fading out from above-mentioned storer; Execution unit, during at least one the time shaft in described first burst and the secondary signal sequence compressed at least and expand one; The cross fade parts, after first burst and secondary signal sequence are compressed or expand, the parts of described first burst of cross fade and secondary signal sequence; Described execution unit comprises the adjustment component with a plurality of adjusting stages, and wherein first adjusting stage was adjusted the phase differential of described first and second bursts by the piece of adjusting described first and second bursts so that make described phase differential minimum; Described execution unit comprises that further the fundamental tone component with described first and second bursts is used for the parts of adjustment of the piece of described first and second bursts.This adjustment component detects its phase differential to 2 bursts as the fade in side and the side of fading out of the time shaft skew of the input of cross fade parts, proofreaies and correct its phase differential;
Adjustment component has the adjustment function in a plurality of stages,
At the 1st phase differential in the adjusting stage, 2 bursts are divided into the piece of regulation respectively, ask the typical value of each piece, asking 2 bursts with the typical value of obtaining is the skew of the phase differential piece hour of unit with the piece, in 2 bursts, the burst of the side of will fading in moves the amount of the skew of obtaining
At the 1st phase differential after the adjusting stage, at the 2nd later phase differential in the adjusting stage, to 2 bursts, be unit or be unit with 1 sample with several samples, ask than with the piece being the meticulousr phase differential of unit, in 2 bursts, the burst of the side of will fading in moves the amount of the phase differential of obtaining
After adjustment component was finished the phase differential adjustment, the cross fade parts carry out cross fade to be handled.
According to this structure, even in the processing form that with the piece is unit, operand and memory span seldom get final product.
Description of drawings
Fig. 1 (a) is the block scheme of the musical interval changing device of the embodiment of the invention 1.
Fig. 1 (b) is the process flow diagram of its phase differential adjustment component.
Fig. 2 (a) is the interval key diagram that its phase differential is adjusted.
Fig. 2 (b) is the key diagram that its 1st phase differential adjusted.
Fig. 2 (c) is the least squares error key diagram that its 1st phase differential adjusted.
Fig. 2 (d) is the interval key diagram that its phase differential is adjusted.
Fig. 3 (a) is the interval key diagram that its phase differential is adjusted.
Fig. 3 (b) is the key diagram that its 1st phase differential adjusted.
Fig. 3 (c) is the least squares error key diagram that its 1st phase differential adjusted.
Fig. 3 (d) is the interval key diagram that its phase differential is adjusted.
Fig. 4 is the key diagram of the typical value of its square frame.
Fig. 5 is the least squares error key diagram that its 2nd phase differential adjusted.
Fig. 6 is the key diagram that the flase drop of prior art 2 is surveyed.
Fig. 7 is the graph of a relation of reading/write the address of the embodiment of the invention 1.
Fig. 8 is the block scheme of the musical interval changing device of prior art 1.
Fig. 9 (a) is the principle key diagram (original signal) of interval change.
Fig. 9 (b) is the principle key diagram (time shaft compressed signal) of interval change.
Fig. 9 (c) is the principle key diagram (time shaft spread signal) of interval change.
Figure 10 (a) is the key diagram (time shaft compression) that cross fade is handled.
Figure 10 (b) is the key diagram (time shaft expansion) that cross fade is handled.
Figure 11 is the key diagram that concerns between cross fade processing and the tremolo sense.
Figure 12 is the key diagram that concerns between cross fade processing and the tremolo sense.
Embodiment
Below, with reference to accompanying drawing embodiments of the invention are described.
(embodiment 1)
The musical interval changing device of the embodiment of the invention 1 is provided with the phase differential adjustment component, and the phase differential adjustment component divides 2 stages to adjust phase differential.
Fig. 1 (a) is the block scheme of the musical interval changing device of present embodiment.
Musical interval changing device shown in Fig. 1 (a) comprises: storer 1; Filtering operation parts 2a, 2b; Cross fade parts 3; Read address production part 4; Phase differential adjustment component 5; Interval signal input end 6; Acoustic signal input terminal 7; Acoustic signal lead-out terminal 8.
Read address production part 4 and generate the address of reading of the signal that will read from storer 1 according to signal from interval signal input end 6.
Filtering operation parts 2a, 2b carry out Filtering Processing to the signal from storer 1, and rise time axial compression reducing and expansion exhibition signal outputs to cross fade parts 3.
After cross fade parts 3 carried out the cross fade processing, from sound equipment lead-out terminal 8 output interval change signals.
Phase differential adjustment component 5 is delivered to its value and is read address production part 4, the amount of the burst mobile phase potential difference of the side of will fading in according to overlap the phase differential that bursts are asked this 2 cover burst from 2 of storer 1.
Before cross fade was handled beginning, the multiplication coefficient of the burst of the side of fading in was zero, and the multiplication coefficient of the side of fading out is 1.Therefore, in sound equipment output, only occur the fading out component of burst of side.At this moment, because the multiplication coefficient of the side of fading in is zero, so, also can harmful effect not arranged to sound equipment output even move the burst of the side of fading in.
Key point of the present invention is this phase differential adjustment component 5, is the operation center, that ask phase differential and movable signal sequence so the following describes with phase differential adjustment component 5.
Shown in Fig. 1 (b), constitute following 2 grades: the 1st phase differential detection and the 1st the phase differential adjustment of adjusting based on time shaft; And the 2nd phase differential detects and the 2nd phase differential adjustment adjusting based on time shaft.
The moment that these phase differential are adjusted at before the cross fade processing carries out.
At first, 2 bursts are divided into piece (some audio format is cut apart at the very start) respectively.
For example, 32 samples are 1 piece.
Shown in Fig. 2 (a), 14 pieces that consideration will begin before the cross fade are used for the example that phase differential is adjusted.
Suppose that in these 14 pieces preceding half 12 pieces are used for the 1st phase differential adjustment, later half 2 pieces are used for the 2nd phase differential adjustment.The 2nd phase differential adjustment is used for fine setting, so need not to distribute too many piece number.For example, just much of that about 1～3 piece.
The 1st phase differential adjustment of explanation earlier.
At first, ask the typical value of each piece.
As shown in Figure 4, this typical value is the value that the burst in the piece is applied the low-pass filtering gained.
In Fig. 4,1 sample of symbol zero expression surrounds the dashed rectangle of a plurality of samples and represents 1 piece.In the example of Fig. 4, what illustrate is that adjacent block intersects a part mutually, even but do not intersect so originally, can use the present invention too.
Here, consider to improve the situation of interval.
Shown in Fig. 2 (b), be benchmark with the piece 7～12 of the burst of the side of fading out, to following 7 chunks of the burst of the side of fading in
(0)7～12 (1)6～11 (2)5～10
(3) 4～9 (4) 3～8 (5) 2～7 (6) 1～6, ask the piece string of phase differential minimum.Enumerated the group that can be used as skew and set up for these 7 groups.
Shown in Fig. 2 (c), this example of asking method is the method that makes the least squares error minimum of corresponding piece.
From piece ask each difference ahead, ask its quadratic sum, the amount of movement when skew of the piece under the situation that its value is minimum is adjusted as the 1st phase differential.
In above-mentioned example, if (4) 3～8 piece string minimum, then shown in Fig. 2 (d), the burst of the fade in side corresponding with the side 13,14 of fading out moves 9,10 behind 4 pieces for the burst from the past.
Under the situation that reduces interval, with the burst of reference block string as the side of fading in.
Shown in Fig. 3 (b), be benchmark with the piece 7～12 of the burst of the side of fading in, same with the situation that improves interval, to following 7 chunks of the burst of the side of fading out
(0)7～12 (1)6～11 (2)5～10
(3) 4～9 (4) 3～8 (5) 2～7 (6) 1～6, ask the piece string of phase differential minimum.
In above-mentioned example, if (3) 4～9 piece string minimum, then shown in Fig. 3 (d), the burst of the fade in side corresponding with the side 13,14 of fading out moves 16,17 behind 3 pieces for the burst from future.
Then, the 2nd phase differential adjustment is described.
As shown in Figure 5, will fade out side as benchmark.
For example, (12,14,16,18,20) individual sample in 32 samples of employing.
Relative therewith, same with the 1st phase differential adjustment, the side of fading in is asked the sequence of least squares error minimum to the individual sample of (1,3,5,7,9,11) individual sample to the (22,24,26,28,30,32).Here, be not that one in whole samples are not handled with leaking, but in reasonable range, sample drawn reduce treatment capacity.
For example, under the situation of (7,9,11,13,15,17) the individual sample that has been offset 5 samples, the training sequence of the side of will fading in moves 5 sample sizes from the past burst.
The 2nd phase differential adjustment can be carried out repeatedly.
In this example, can the fade out piece of side is that 2 times of situation of 13 situation and 14 are adjusted.
In addition, the 2nd phase differential adjustment can be benchmark with the side of fading in also.
Yet, ask the side of fading in that remains that moves behind the phase differential.This is because before cross fade was handled beginning, the multiplication coefficient of the burst of the side of fading in was zero.
The effect of present embodiment then, is described.
At first, by the phase differential adjustment component being divided into the 1st time and the 2nd these 2 stages (a plurality of stage), can cut down operand and storer.
At first pass through to use the typical value of each piece in the 1st time, in above-mentioned example, 7 kinds of least errors of a demand get final product.
In addition, each piece is only needed 1 typical value is kept in the storer get final product.
If think only to comprise with the method for the 2nd phase differential adjustment component the scope of the 1st phase differential adjustment, then operand increases 1 order of magnitude approximately.
In addition, owing to corresponding whole burst must be kept in the storer, so memory span also increases.
Like this, the phase differential adjustment component is divided into 2 stages, very big effect is arranged cutting down operand and memory span.
In addition, the typical value of piece is the value that the burst in the piece is applied the low-pass filtering gained.
Generally, note signal is to be fundamental tone with minimum frequency, combines with the partials of the integral multiple of this fundamental frequency.
If make phase place consistent with this fundamental tone, then its homophonic phase place is also consistent.
On the contrary, if homophonic phase place unanimity, then the phase place of fundamental tone is not necessarily consistent.
Fig. 6 illustrates this example.In Fig. 6, be conceived to the big homophonic component of amplitude, in order to make the phase place unanimity, the phase place of fundamental tone has skew.
Fig. 6 represents if the peak value according to amplitude makes the phase place unanimity as prior art 2, and then the possibility of flase drop survey phase differential is very big.
That is, in prior art 2, the reason of the maximum that the phase differential flase drop is surveyed is, the result obtains fundamental tone but obtains homophonic phase differential.
On the other hand, in the present embodiment,, use the output of low-pass filter, then reduced the level of surveying the partials of reason as the phase differential flase drop, take out the fundamental tone component, survey so can reduce the flase drop of phase differential significantly if when asking the typical value of piece.
Even it is also no problem that fundamental tone is the frequency higher than the cutoff frequency of this low-pass filter.
Thereby also it doesn't matter to select the piece of which phase differential in the 1st phase place adjusted.
This is because the frequency height of fundamental tone so 1 periodic packets is contained in 1 piece, only needs the 2nd phase place adjustment just can fully carry out the phase place adjustment.
Moreover, in the 1st phase differential adjusted, under the situation that improves interval, be benchmark with the burst of the side of fading out, obtain and the burst of the side of fading in of time migration between phase differential, come mobile acoustic signal from the past burst.
And reducing under the situation of interval, be benchmark with the burst of the side of fading in, obtain and the burst of the side of fading out of time migration between phase differential, never burst comes mobile acoustic signal.
Even under the situation that has phase differential adjustment component 5, these operations also help to cut down the capacity of the storer 1 among Fig. 1 (a).
Fig. 7 illustrates writing the address and reading relation between the address in the storer 1.
For example, improving under the situation of interval, because the renewal speed of the address of reading from storer 1 is fast, so the address of the signal of record sound equipment input terminal 7 need be set at and have surplus, makes not and to be read the value that catch up with the address by aforementioned.
Improving under the situation of interval, is benchmark with the burst of the side of fading in, consequently, and can be from the burst in future amount with acoustic signal mobile phase potential difference.
Yet, in the case, except above-mentioned surplus,, also need to prepare to be equivalent to the storer of the desirable peaked amount of its amount of movement (being 6 pieces in this example) for from mobile acoustic signal in future.
The situation of reduction interval too.
Because the renewal speed of the address of reading from storer 1 is slow, so the address of the signal of record sound equipment input terminal 7 need be set at and have surplus, makes and do not catch up with aforementioned value of reading the address.
Reducing under the situation of interval, be benchmark with the burst of reading side, consequently, can be from the burst in past amount with acoustic signal mobile phase potential difference.
In the method for the invention, the burst from the past comes movement value under the situation of interval improving, and under the situation that reduces interval never burst come movement value, increase new storer so need not to follow the 1st phase differential adjustment.
According to the present invention, by a plurality of stages after the phase differential adjustment being divided into the 1st time and the 2nd time, it is the adjustment of unit that the 1st phase differential is adjusted into the piece, thereby can cut down operand and memory span.
In addition, be used as the typical value of the piece of the 1st phase differential adjustment component, thereby the flase drop that can reduce phase differential is surveyed by the output of using low-pass filter.
Moreover, in the 1st phase differential adjusted, under the situation that improves interval, be benchmark with the burst of the side of fading out, obtain and the burst of the side of fading in of time migration between phase differential, come mobile acoustic signal from the burst in past.
Reducing under the situation of interval, is benchmark with the burst of the side of fading in, obtain and the burst of the side of fading out of time migration between phase differential, come mobile acoustic signal from the burst in future.
This operation has the effect of cutting down storer.
That is, the present invention can provide a kind of musical interval changing device, and the flase drop of its phase differential is surveyed few, and operand and memory span are few in piece is handled, and the tremolo sense is few.
Claims (14)
1, a kind of interval change method is characterized in that, comprising:
The acoustic signal that digital signal sequences is represented stores the step in the storer into;
From above-mentioned storer, read the step of a secondary signal sequence of one first burst of the side of fading in and the side of fading out;
One step during at least one time shaft in described first burst and the secondary signal sequence compressed at least and expand;
The step of described first and second bursts of cross fade after carrying out the step that produces output signal;
Detect and compensate the phase differential of described first and second bursts so that make the step of described phase differential minimum by the piece of adjusting described first and second bursts; And
The step of utilizing the fundamental tone in described first and second bursts to detect and compensate.
2, interval change method as claimed in claim 1 is characterized in that, the correction of phase differential is made of the combination of rough level correction and meticulous level correction.
3, interval change method as claimed in claim 2 is characterized in that, rough level correction is that unit carries out with the piece of burst, and meticulous level correction is that unit carries out with the sample that constitutes piece.
4, interval change method as claimed in claim 1 is characterized in that, the fundamental tone component applies low-pass filtering to burst and extracts.
5, interval change method as claimed in claim 1 is characterized in that,
Also comprise phase differential adjustment processing, 2 bursts that this phase differential adjustment is handled the fade in side and the side of fading out of the time shaft skew of the input of handling as cross fade detect its phase differential, and proofread and correct its phase differential;
Above-mentioned phase differential adjustment is handled has the adjustment function in a plurality of stages,
At the 1st phase differential in the adjusting stage, 2 bursts are divided into the piece of regulation respectively, ask the typical value of each piece, ask with the typical value of obtaining that to make 2 bursts be the side-play amount of the phase differential piece hour of unit with the piece, in 2 bursts, the burst of the side of will fading in moves the amount of the skew of obtaining
At the 1st phase differential after the adjusting stage, at the 2nd later phase differential in the adjusting stage, 2 bursts are unit with 1 sample or are that unit asks than being the meticulousr phase differential of unit with the piece with several samples, in 2 bursts, the burst of the side of will fading in moves the amount of the phase differential of obtaining
After above-mentioned phase differential adjustment is finished dealing with, carry out cross fade and handle.
6, interval change method as claimed in claim 5 is characterized in that, as the typical value of piece, uses the output valve that the burst in the piece is applied the low-pass filtering gained.
7, interval change method as claimed in claim 5 is characterized in that,
In at least a portion of phase differential adjusting stage,
Under the situation that improves interval, the direction of signal moves the burst of the side of will fading in to using in the past;
Under the situation that reduces interval, the burst of the side of will fading in moves to the direction of using following signal.
8, a kind of musical interval changing device is characterized in that, comprising:
Storer, the acoustic signal that the storage digital signal sequences is represented;
Fetch unit is read the parts of a secondary signal sequence of one first burst of the side of fading in and the side of fading out from above-mentioned storer;
Execution unit, during at least one the time shaft in described first burst and the secondary signal sequence compressed at least and expand one;
The cross fade parts, after first burst and secondary signal sequence are compressed or expand, the parts of described first burst of cross fade and secondary signal sequence;
Described execution unit comprises the adjustment component with a plurality of adjusting stages, and wherein first adjusting stage was adjusted the phase differential of described first and second bursts by the piece of adjusting described first and second bursts so that make described phase differential minimum;
Described execution unit comprises that further the fundamental tone component with described first and second bursts is used for the parts of adjustment of the piece of described first and second bursts.
9, musical interval changing device as claimed in claim 8 is characterized in that, the correction of phase differential is made of the combination of rough level correction and meticulous level correction.
10, musical interval changing device as claimed in claim 9 is characterized in that, rough level correction is that unit carries out with the piece of burst, and meticulous level correction is that unit carries out with the sample that constitutes piece.
11, musical interval changing device as claimed in claim 8 is characterized in that, the fundamental tone component applies low-pass filtering to burst and extracts.
12, musical interval changing device as claimed in claim 8 is characterized in that,
Described adjustment component detects its phase differential to 2 bursts as the fade in side and the side of fading out of the time shaft skew of the input of cross fade parts, and proofreaies and correct its phase differential;
Above-mentioned adjustment component has the adjustment function in a plurality of stages,
At the 1st phase differential in the adjusting stage, 2 bursts are divided into the piece of regulation respectively, ask the typical value of each piece, ask with the typical value of obtaining that to make 2 bursts be the skew of the phase differential piece hour of unit with the piece, in 2 bursts, the burst of the side of will fading in moves the amount of the skew of obtaining
At the 1st phase differential after the adjusting stage, at the 2nd later phase differential in the adjusting stage, 2 bursts are unit with 1 sample or are that unit asks than being the meticulousr phase differential of unit with the piece with several samples, in 2 bursts, the burst of the side of will fading in moves the amount of the phase differential of obtaining
After above-mentioned adjustment component was finished the phase differential adjustment, above-mentioned cross fade parts carry out cross fade to be handled.
13, musical interval changing device as claimed in claim 12 is characterized in that, uses the output valve that the burst in the piece is applied the low-pass filtering gained as the typical value of piece.
14, musical interval changing device as claimed in claim 12 is characterized in that,
In at least a portion of phase differential adjusting stage,
Under the situation that improves interval, the direction of signal moves the burst of the side of will fading in to using in the past;
Under the situation that reduces interval, the burst of the side of will fading in moves to the direction of using following signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP288349/2000 | 2000-09-22 | ||
| JP2000288349 | 2000-09-22 | ||
| JP288349/00 | 2000-09-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1347076A CN1347076A (en) | 2002-05-01 |
| CN1185627C true CN1185627C (en) | 2005-01-19 |
Family
ID=18771943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011406917A Expired - Lifetime CN1185627C (en) | 2000-09-22 | 2001-09-21 | Interval change method and device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6909924B2 (en) |
| JP (1) | JP4520082B2 (en) |
| KR (1) | KR100833401B1 (en) |
| CN (1) | CN1185627C (en) |
| TW (1) | TW525146B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100499222B1 (en) * | 2002-10-05 | 2005-07-05 | 주식회사 코맥스 | Generation apparatus for ring-back tone of telephone |
| US8296143B2 (en) * | 2004-12-27 | 2012-10-23 | P Softhouse Co., Ltd. | Audio signal processing apparatus, audio signal processing method, and program for having the method executed by computer |
| US20070036297A1 (en) * | 2005-07-28 | 2007-02-15 | Miranda-Knapp Carlos A | Method and system for warping voice calls |
| JP4622908B2 (en) * | 2006-03-28 | 2011-02-02 | ヤマハ株式会社 | Signal processing device |
| JP4757130B2 (en) * | 2006-07-20 | 2011-08-24 | 富士通株式会社 | Pitch conversion method and apparatus |
| JP2008262021A (en) * | 2007-04-12 | 2008-10-30 | Hiromi Murakami | Phase switching device in electric musical instrument |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS606998A (en) * | 1983-06-24 | 1985-01-14 | ソニー株式会社 | Signal processor |
| JPS60176100A (en) | 1984-02-22 | 1985-09-10 | 赤井電機株式会社 | Signal pitch converter |
| US4706537A (en) * | 1985-03-07 | 1987-11-17 | Nippon Gakki Seizo Kabushiki Kaisha | Tone signal generation device |
| JP3435168B2 (en) * | 1991-11-18 | 2003-08-11 | パイオニア株式会社 | Pitch control device and method |
| JP3076859B2 (en) | 1992-04-20 | 2000-08-14 | 三菱電機株式会社 | Digital audio signal processor |
| JP3296648B2 (en) | 1993-11-30 | 2002-07-02 | 三洋電機株式会社 | Method and apparatus for improving discontinuity in digital pitch conversion |
| JP4121578B2 (en) * | 1996-10-18 | 2008-07-23 | ソニー株式会社 | Speech analysis method, speech coding method and apparatus |
| JP3073942B2 (en) * | 1997-09-12 | 2000-08-07 | 日本放送協会 | Audio processing method, audio processing device, and recording / reproducing device |
| US6470309B1 (en) * | 1998-05-08 | 2002-10-22 | Texas Instruments Incorporated | Subframe-based correlation |
| JP3506012B2 (en) | 1998-07-30 | 2004-03-15 | ヤマハ株式会社 | Pitch / Tempo conversion method |
-
2001
- 2001-09-06 TW TW090122144A patent/TW525146B/en not_active IP Right Cessation
- 2001-09-19 JP JP2001285009A patent/JP4520082B2/en not_active Expired - Lifetime
- 2001-09-20 US US09/957,320 patent/US6909924B2/en not_active Expired - Lifetime
- 2001-09-21 CN CNB011406917A patent/CN1185627C/en not_active Expired - Lifetime
- 2001-09-21 KR KR1020010058536A patent/KR100833401B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR20020023153A (en) | 2002-03-28 |
| JP2002169556A (en) | 2002-06-14 |
| US6909924B2 (en) | 2005-06-21 |
| TW525146B (en) | 2003-03-21 |
| US20020071575A1 (en) | 2002-06-13 |
| JP4520082B2 (en) | 2010-08-04 |
| KR100833401B1 (en) | 2008-05-28 |
| CN1347076A (en) | 2002-05-01 |
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